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3 Commits

Author SHA1 Message Date
e4587f7c82 Specular BDRF 2023-06-05 18:40:06 +02:00
ae516a8007 Irradiance Map 2023-06-02 20:07:32 +02:00
6fd22a85d8 HDR skybox 2023-06-02 18:01:45 +02:00
36 changed files with 809 additions and 27 deletions

1
.gitattributes vendored
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@ -2,3 +2,4 @@
*.mtl filter=lfs diff=lfs merge=lfs -text
*.jpg filter=lfs diff=lfs merge=lfs -text
*.png filter=lfs diff=lfs merge=lfs -text
*.hdr filter=lfs diff=lfs merge=lfs -text

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Shaders/BRDFIntegration.fs Normal file
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@ -0,0 +1,111 @@
#version 460 core
out vec2 FragColor;
in vec2 TexCoords;
const float PI = 3.14159265359;
// http://holger.dammertz.org/stuff/notes_HammersleyOnHemisphere.html
// efficient VanDerCorpus calculation.
float RadicalInverse_VdC(uint bits)
{
bits = (bits << 16u) | (bits >> 16u);
bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
return float(bits) * 2.3283064365386963e-10; // / 0x100000000
}
vec2 Hammersley(uint i, uint N)
{
return vec2(float(i)/float(N), RadicalInverse_VdC(i));
}
float GeometrySchlickGGX(float NdotV, float roughness)
{
float a = roughness;
float k = (a * a) / 2.0;
float nom = NdotV;
float denom = NdotV * (1.0 - k) + k;
return nom / denom;
}
vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness){
float a = roughness*roughness;
float phi = 2.0 * PI * Xi.x;
float cosTheta = sqrt((1.0 - Xi.y) / (1.0 + (a*a - 1.0) * Xi.y));
float sinTheta = sqrt(1.0 - cosTheta*cosTheta);
// Spherical to cartesian
vec3 H;
H.x = cos(phi) * sinTheta;
H.y = sin(phi) * sinTheta;
H.z = cosTheta;
// tangent space to world sample vector
vec3 up = abs(N.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0);
vec3 tangent = normalize(cross(up,N));
vec3 bitangent = cross(N, tangent);
vec3 sampleVec = tangent * H.x + bitangent * H.y + N * H.z;
return normalize(sampleVec);
}
float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
{
float NdotV = max(dot(N, V), 0.0);
float NdotL = max(dot(N, L), 0.0);
float ggx2 = GeometrySchlickGGX(NdotV, roughness);
float ggx1 = GeometrySchlickGGX(NdotL, roughness);
return ggx1 * ggx2;
}
vec2 IntegrateBRDF (float NdotV, float roughness){
vec3 V;
V.x = sqrt(1.0 - NdotV * NdotV);
V.y = 0.0;
V.z = NdotV;
float A = 0.0;
float B = 0.0;
vec3 N = vec3(0.0,0.0,1.0);
const uint SAMPLE_COUNT = 1024u;
for(uint i = 0u; i < SAMPLE_COUNT; ++i){
vec2 Xi = Hammersley(i, SAMPLE_COUNT);
vec3 H = ImportanceSampleGGX(Xi, N, roughness);
vec3 L = normalize(2.0 * dot(V, H) * H - V);
float NdotL = max(L.z, 0.0);
float NdotH = max(H.z, 0.0);
float VdotH = max(dot(V, H), 0.0);
if(NdotL > 0.0)
{
float G = GeometrySmith(N, V, L, roughness);
float G_Vis = (G * VdotH) / (NdotH * NdotV);
float Fc = pow(1.0 - VdotH, 5.0);
A += (1.0 - Fc) * G_Vis;
B += Fc * G_Vis;
}
}
A /= float(SAMPLE_COUNT);
B /= float(SAMPLE_COUNT);
return vec2(A, B);
}
void main()
{
vec2 integratedBRDF = IntegrateBRDF(TexCoords.x, TexCoords.y);
FragColor = integratedBRDF;
}

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@ -0,0 +1,10 @@
#version 460 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec2 aTexCoords;
out vec2 TexCoords;
void main(){
TexCoords = aTexCoords;
gl_Position = vec4(aPos, 1.0);
}

22
Shaders/HDRMap.fs Normal file
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@ -0,0 +1,22 @@
#version 460 core
out vec4 FragColor;
in vec3 localPos;
uniform sampler2D equirectangularMap;
const vec2 invAtan = vec2(0.1591, 0.3183);
vec2 SampleSphericalMap(vec3 v)
{
vec2 uv = vec2(atan(v.z, v.x), asin(v.y));
uv *= invAtan;
uv += 0.5;
return uv;
}
void main(){
vec2 uv = SampleSphericalMap(localPos);
vec3 color = texture(equirectangularMap, uv).rgb;
FragColor = vec4(color,1.0);
}

12
Shaders/HDRMap.vs Normal file
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@ -0,0 +1,12 @@
#version 460 core
layout (location = 0) in vec3 aPos;
out vec3 localPos;
uniform mat4 projection;
uniform mat4 view;
void main(){
localPos = aPos;
gl_Position = projection * view * vec4(localPos, 1.0);
}

15
Shaders/HDRSkybox.fs Normal file
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@ -0,0 +1,15 @@
#version 460 core
out vec4 FragColor;
in vec3 localPos;
uniform samplerCube environmentMap;
void main(){
vec3 envColor = texture(environmentMap, localPos).rgb;
envColor = envColor /(envColor + vec3(1.0));
envColor = pow(envColor, vec3(1.0/2.2));
FragColor = vec4(envColor,1.0);
}

16
Shaders/HDRSkybox.vs Normal file
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@ -0,0 +1,16 @@
#version 460 core
layout (location = 0) in vec3 aPos;
uniform mat4 projection;
uniform mat4 view;
out vec3 localPos;
void main(){
localPos = aPos;
mat4 rotView = mat4(mat3(view));
vec4 clipPos = projection * rotView * vec4(localPos,1.0);
gl_Position = clipPos.xyww;
}

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Shaders/irradienceconv.fs Normal file
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#version 460 core
out vec4 FragColor;
in vec3 localPos;
uniform samplerCube environmentMap;
const float PI = 3.14159265359;
void main(){
vec3 normal = normalize(localPos);
vec3 irradiance = vec3(0.0);
vec3 up = vec3(0.0, 1.0, 0.0);
vec3 right = normalize(cross(up, normal));
up = normalize(cross(normal, right));
float sampleDelta = 0.025;
float nrSamples = 0.0;
for(float phi = 0.0; phi < 2.0 * PI; phi += sampleDelta){
for(float theta = 0.0; theta < 0.5 * PI; theta += sampleDelta){
// spherical to cartesian
vec3 tangentSample = vec3(sin(theta) * cos(phi), sin(theta) * sin(phi), cos(theta));
// tangent space to world
vec3 sampleVec = tangentSample.x * right + tangentSample.y * up + tangentSample.z * normal;
irradiance += texture(environmentMap, sampleVec).rgb * cos(theta) * sin(theta);
nrSamples++;
}
}
irradiance = PI * irradiance * (1.0 / float(nrSamples));
FragColor = vec4(irradiance,1.0);
}

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@ -13,6 +13,11 @@ uniform sampler2D normalMap;
uniform sampler2D roughnessMap;
uniform sampler2D aoMap;
uniform samplerCube irradianceMap;
uniform samplerCube prefilterMap;
uniform sampler2D brdfLUT;
uniform vec3 lightPositions[4];
uniform vec3 lightColors[4];
@ -21,9 +26,9 @@ const float PI = 3.14159265359;
// ratio Refraction vs Reflection (F function)
vec3 fresnelSchlick (float cosTheta, vec3 F0)
vec3 fresnelSchlick (float cosTheta, vec3 F0, float roughness)
{
return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
return F0 + (max(vec3(1.0- roughness), F0)- F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
}
// Calculate Normal distribution (D function)
@ -76,6 +81,8 @@ vec3 getNormalFromNormalMap(){
return normalize(TBN * tangentNormal);
}
void main(){
vec3 albedo = pow(texture(albedoMap, TexCoords).rgb, vec3(2.2));
@ -86,6 +93,8 @@ void main(){
vec3 N = getNormalFromNormalMap();
vec3 V = normalize(camPos - WorldPos);
vec3 R = reflect(-V, N);
vec3 F0 = vec3(0.04);
F0 = mix(F0, albedo, metallic);
@ -102,7 +111,7 @@ void main(){
float NDF = DistributionGGX(N,H, roughness);
float G = GeometrySmith(N,V,L, roughness);
vec3 F = fresnelSchlick(max(dot(H,V), 0.0), F0);
vec3 F = fresnelSchlick(max(dot(H,V), 0.0), F0, roughness);
vec3 kS = F;
vec3 kD = vec3(1.0) - kS;
@ -118,8 +127,23 @@ void main(){
Lo += (kD * albedo / PI + specular) * radiance * NdotL;
}
// Calculate the ambient term and add it
vec3 ambient = vec3(0.03) * albedo * ao;
vec3 kS = fresnelSchlick(max(dot(N,V), 0.0), F0, roughness);
vec3 kD = 1.0 - kS;
kD *= 1.0 - metallic;
vec3 irradiance = texture(irradianceMap, N).rgb;
vec3 diffuse = irradiance* albedo;
const float MAX_REFLECTION_LOD = 4.0;
vec3 prefilterColor = textureLod(prefilterMap, R, roughness * MAX_REFLECTION_LOD).rgb;
vec2 envBRDF = texture(brdfLUT, vec2(max(dot(N,V), 0.0), roughness)).rg;
vec3 specular = prefilterColor * (kS * envBRDF.x + envBRDF.y);
vec3 ambient = (kD * diffuse + specular) * ao;
vec3 color = ambient + Lo;
// HDR tonemapping

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Shaders/prefilter.fs Normal file
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@ -0,0 +1,71 @@
#version 460 core
out vec4 FragColor;
in vec3 localPos;
uniform samplerCube environmentMap;
uniform float roughness;
const float PI = 3.14159265359;
vec3 ImportanceSampleGGX(vec2 Xi, vec3 N, float roughness){
float a = roughness*roughness;
float phi = 2.0 * PI * Xi.x;
float cosTheta = sqrt((1.0 - Xi.y) / (1.0 + (a*a - 1.0) * Xi.y));
float sinTheta = sqrt(1.0 - cosTheta*cosTheta);
// Spherical to cartesian
vec3 H;
H.x = cos(phi) * sinTheta;
H.y = sin(phi) * sinTheta;
H.z = cosTheta;
// tangent space to world sample vector
vec3 up = abs(N.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0);
vec3 tangent = normalize(cross(up,N));
vec3 bitangent = cross(N, tangent);
vec3 sampleVec = tangent * H.x + bitangent * H.y + N * H.z;
return normalize(sampleVec);
}
// Generate Van Der Corput sequence
float RadicalInverse_VdC(uint bits){
bits = (bits << 16u) | (bits >> 16u);
bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
return float(bits) * 2.3283064365386963e-10; // / 0x100000000
}
vec2 Hammersley(uint i, uint N){
return vec2(float(i)/float(N), RadicalInverse_VdC(i));
}
void main(){
vec3 N = normalize(localPos);
vec3 R = N;
vec3 V = R;
const uint SAMPLE_COUNT = 1024u;
float totalWeight = 0.0;
vec3 prefilteredColor = vec3(0.0);
for(uint i = 0u; i < SAMPLE_COUNT; ++i)
{
vec2 Xi = Hammersley(i, SAMPLE_COUNT);
vec3 H = ImportanceSampleGGX(Xi, N, roughness);
vec3 L = normalize(2.0 * dot(V,H) * H - V );
float NdotL = max(dot(N, L), 0.0);
if(NdotL > 0.0){
prefilteredColor += texture(environmentMap, L).rgb * NdotL;
totalWeight += NdotL;
}
}
prefilteredColor = prefilteredColor / totalWeight;
FragColor = vec4(prefilteredColor, 1.0);
}

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Shaders/skybox2.vs Normal file
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#version 460 core
layout (location = 0) in vec3 aPos;
out vec3 localPos;
uniform mat4 projection;
uniform mat4 view;
void main()
{
localPos = aPos;
gl_Position = projection * view * vec4(localPos ,1.0);
}

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Textures/beaten-down-brick/albedo.png (Stored with Git LFS) Normal file

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Textures/beaten-down-brick/beaten-down-brick_height.png (Stored with Git LFS) Normal file

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Textures/space-cruiser/albedo.png (Stored with Git LFS) Normal file

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Textures/space-cruiser/space-cruiser-panels2_height.png (Stored with Git LFS) Normal file

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@ -17,6 +17,7 @@ void Skybox::Destroy() {
std::cout << "Skybox destroyed!" << std::endl;
}
void Skybox::loadCubeTextures(const std::vector<std::string>& texture_faces)
{
glGenTextures(1, &id);

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@ -9,4 +9,5 @@ struct Texture{
std::string path;
};
Texture* CreateTexture(unsigned int width, unsigned int height);

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@ -11,9 +11,11 @@
#include <glm/gtc/type_ptr.hpp>
#include "../Primitives/Scene.h"
#include "../model.h"
#include "../Utils.h"
static enum class RenderPass {
NONE = 0,
SKYBOX,
HDR_SKYBOX,
DEFAULT,
PBR
};
@ -43,8 +45,119 @@ unsigned int normal;
unsigned int metallic;
unsigned int roughness;
unsigned int ao;
unsigned int cubeVAO = 0;
unsigned int cubeVBO = 0;
void renderCube() {
if (cubeVAO == 0) {
float vertices[] = {
// back face
-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
-1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, // top-left
// front face
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
-1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
// left face
-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
-1.0f, 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-1.0f, -1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
// right face
1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
// bottom face
-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
-1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
// top face
-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
1.0f, 1.0f , 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
-1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
};
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
// fill buffer
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// link vertex attributes
glBindVertexArray(cubeVAO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// render Cube
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
}
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()
{
if (quadVAO == 0)
{
float quadVertices[] = {
// positions // texture Coords
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
};
// setup plane VAO
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
unsigned int brdfLUTTexture;
unsigned int prefilterMap;
unsigned int irradianceMap;
unsigned int envCubemap;
unsigned int envMapVAO;
void Renderer::Setup()
{
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
// Create ScreenVAO
glGenVertexArrays(1, &ScreenVAO);
glBindVertexArray(ScreenVAO);
@ -70,17 +183,239 @@ void Renderer::Setup()
// Load shaders
shaders[static_cast<int>(RenderPass::SKYBOX)] = Shader();
shaders[static_cast<int>(RenderPass::SKYBOX)].Load("../Shaders/skybox.vs", "../Shaders/Cubemap.fs");
shaders[static_cast<int>(RenderPass::HDR_SKYBOX)] = Shader();
shaders[static_cast<int>(RenderPass::HDR_SKYBOX)].Load("../Shaders/HDRSkybox.vs", "../Shaders/HDRSkybox.fs");
shaders[static_cast<int>(RenderPass::DEFAULT)] = Shader();
shaders[static_cast<int>(RenderPass::DEFAULT)].Load("../Shaders/shader.vs", "../Shaders/shader.fs");
shaders[static_cast<int>(RenderPass::PBR)] = Shader();
shaders[static_cast<int>(RenderPass::PBR)].Load("../Shaders/pbr.vs", "../Shaders/pbr.fs");
albedo = TextureFromFile("../Textures/rusted_iron/albedo.png", ".");
normal = TextureFromFile("../Textures/rusted_iron/normal.png", ".");
metallic = TextureFromFile("../Textures/rusted_iron/metallic.png", ".");
roughness = TextureFromFile("../Textures/rusted_iron/roughness.png", ".");
ao = TextureFromFile("../Textures/rusted_iron/ao.png",".");
albedo = TextureFromFile("../Textures/space-cruiser/albedo.png", ".");
normal = TextureFromFile("../Textures/space-cruiser/normal.png", ".");
metallic = TextureFromFile("../Textures/space-cruiser/metallic.png", ".");
roughness = TextureFromFile("../Textures/space-cruiser/roughness.png", ".");
ao = TextureFromFile("../Textures/space-cruiser/ao.png",".");
// Create the skybox from an HDR equirectangular environment map
unsigned int captureFBO, captureRBO;
glGenFramebuffers(1, &captureFBO);
glGenRenderbuffers(1, &captureRBO);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, captureRBO);
glGenTextures(1, &envCubemap);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
for (unsigned int i = 0; i < 6; ++i) {
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 512, 512, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glm::mat4 captureProjection = glm::perspective(glm::radians(90.0f), 1.0f, 0.1f, 10.0f);
glm::mat4 captureViews[] = {
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, -1.0f, 0.0f))
};
auto eqShader = Shader();
eqShader.Load("../Shaders/HDRMap.vs", "../Shaders/HDRMap.fs");
auto hdrTexture = LoadIBL("../Textures/night_2k.hdr");
eqShader.use();
eqShader.setInt("equirectangularMap", 0);
eqShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, hdrTexture);
glViewport(0, 0, 512, 512);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
for (unsigned int i = 0; i < 6; ++i) {
eqShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, envCubemap, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// Generate irradiancemap
glGenTextures(1, &irradianceMap);
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
for (unsigned int i = 0; i < 6; ++i) {
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 32, 32, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 32, 32);
auto irradianceShader = Shader();
irradianceShader.Load("../Shaders/skybox2.vs", "../Shaders/irradienceconv.fs");
irradianceShader.use();
irradianceShader.setInt("environmentMap", 0);
irradianceShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glViewport(0, 0, 32, 32);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
for (unsigned int i = 0; i < 6; ++i) {
irradianceShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, irradianceMap, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
glViewport(0, 0, 800, 600); // restore viewport;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
std::vector<float> m_skyboxVertices = {
// positions
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, -1.0f, 1.0f,
-1.0f, -1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
1.0f, 1.0f, -1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, 1.0f,
1.0f, -1.0f, 1.0f
};
unsigned int envMapVBO;
glGenVertexArrays(1, &envMapVAO);
glBindVertexArray(envMapVAO);
glGenBuffers(1, &envMapVBO);
glBindBuffer(GL_ARRAY_BUFFER, envMapVBO);
glBufferData(GL_ARRAY_BUFFER, m_skyboxVertices.size() * sizeof(float), &m_skyboxVertices[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
glBindVertexArray(0);
glGenTextures(1, &prefilterMap);
glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap);
for (unsigned int i = 0; i < 6; ++i) {
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 128, 128, 0, GL_RGB, GL_FLOAT, nullptr);
}
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
auto prefilterShader = Shader();
prefilterShader.Load("../Shaders/skybox2.vs", "../Shaders/prefilter.fs");
prefilterShader.setInt("environmentMap", 0);
prefilterShader.setMat4("projection", captureProjection);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
unsigned int maxMipLevels = 5;
for (unsigned int mip = 0; mip < maxMipLevels; ++mip) {
unsigned int mipWidth = 128 * std::pow(0.5, mip);
unsigned int mipHeight = 128 * std::pow(0.5, mip);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, mipWidth, mipHeight);
glViewport(0, 0, mipWidth, mipHeight);
float roughness = (float)mip / (float)(maxMipLevels - 1);
prefilterShader.setFloat("roughness", roughness);
for (unsigned int i = 0; i < 6; ++i) {
prefilterShader.setMat4("view", captureViews[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, prefilterMap, mip);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderCube();
}
}
glGenTextures(1, &brdfLUTTexture);
// Pre-allocate enough memory for the LUT texture
glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16F, 512, 512, 0, GL_RG, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, brdfLUTTexture, 0);
glViewport(0, 0, 512, 512);
auto brdfShader = Shader();
brdfShader.Load("../Shaders/BRDFIntegration.vs", "../Shaders/BRDFIntegration.fs");
brdfShader.use();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderQuad();
glViewport(0, 0, 800, 600); // reset viewport
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
@ -127,8 +462,6 @@ void Renderer::resize(int width, int height ) {
}
unsigned int sphereVAO = 0;
unsigned int indexCount;
void renderSphere() {
@ -221,9 +554,6 @@ void renderSphere() {
glDrawElements(GL_TRIANGLE_STRIP, indexCount, GL_UNSIGNED_INT, 0);
}
void Renderer::Render(Scene& scene)
{
@ -235,6 +565,7 @@ void Renderer::Render(Scene& scene)
auto model = glm::mat4(1.0f);
// Skybox
#if false
glDepthMask(GL_FALSE);
Shader shader = shaders.at(static_cast<int>(RenderPass::SKYBOX));
@ -252,6 +583,28 @@ void Renderer::Render(Scene& scene)
scene.skybox.Unbind();
glDepthMask(GL_TRUE);
#endif
//HDR Environment Skybox
Shader shader = shaders.at(static_cast<int>(RenderPass::HDR_SKYBOX));
glDepthFunc(GL_LEQUAL);
shader.use();
shader.setMat4("projection", projection);
shader.setMat4("view", scene.MainCamera.GetViewMatrix());
glBindVertexArray(envMapVAO);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
glBindVertexArray(0);
glDepthFunc(GL_LESS);
// Phong lighting
@ -284,6 +637,10 @@ void Renderer::Render(Scene& scene)
shader.setInt("metallicMap", 2);
shader.setInt("roughnessMap", 3);
shader.setInt("aoMap", 4);
shader.setInt("irradianceMap", 5);
shader.setInt("prefilterMap", 6);
shader.setInt("brdfLUT", 7);
shader.setMat4("projection", projection);
view = scene.MainCamera.GetViewMatrix();
@ -302,11 +659,20 @@ void Renderer::Render(Scene& scene)
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, roughness);
glActiveTexture(GL_TEXTURE4);
glBindTexture(GL_TEXTURE_2D, ao);
glActiveTexture(GL_TEXTURE5);
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
glActiveTexture(GL_TEXTURE6);
glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap);
glActiveTexture(GL_TEXTURE7);
glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
// Render Spheres
model = glm::mat4(1.0f);
for (int row = 0; row < nrRows; ++row) {
for (int col = 0; col < nrColumns; ++col) {
@ -367,16 +733,10 @@ void Renderer::Render(Scene& scene)
entity.Draw(OutlineShader);
}
glStencilFunc(GL_ALWAYS, 1, 0xFF);
glStencilMask(0xFF);
*/
glStencilFunc(GL_ALWAYS, 1, 0xFF);
glStencilMask(0xFF);
*/
// 4. draw result to screen

32
src/Utils.h Normal file
View File

@ -0,0 +1,32 @@
#pragma once
#include <string>
#include <iostream>
#include <stb_image.h>
#include <glad/glad.h>
int LoadIBL(std::string file_path) {
stbi_set_flip_vertically_on_load(true);
int width, height, nrComponents;
float* data = stbi_loadf(file_path.c_str(), &width, &height, &nrComponents, 0);
unsigned int hdrTexture;
if (data) {
glGenTextures(1, &hdrTexture);
glBindTexture(GL_TEXTURE_2D, hdrTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
stbi_image_free(data);
}
else {
std::cout << "Failed to load HDR image." << std::endl;
}
return hdrTexture;
}

View File

@ -71,8 +71,6 @@ public:
renderer.Setup();
//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
while(!window.shouldClose())
{